The GAAS – Goel Atlanto-axial Spacer - is a GESCO exclusive patented system used in the C1-C2 Atlanto-axial joint, for basilar invagination, instability of C1-C2 joint and Cranio-vertibral anomalies . GAAS is a revolution in cranio vertebral junction fixation technique.

Joint space with posterior C1-C2 fixation using Plate and screw, thereby forming a tension band, which enables good fusion